base: print release version in case of running unsupported one
base: print release version in case of running unsupported one

User may provide own base image but it needs to be supported one. If it
is not then we print info and error out.

So provide user with info which release is present in their image.

Change-Id: I0d8417fdeb2f02138d03cc57bd3b7b95bc43fc8f

openstack/kolla,stackforge/kolla,stackforge/kolla,stackforge/kolla,openstack/kolla